Question

2×{27-2×[3×-(35:5-2×3)]+3}:4=10

Answer 1

2 × { 27 - 2 × [ 3 x - ( 35 : 5 - 2 × 3 ) ] + 3 } : 4 = 10

2 × { 27 - 2 × [ 3 x -  ( 7 - 6 ) ] + 3 } = 10 × 4

27 - 2 × ( 3 x - 1 ) + 3 = 40 : 2

27 - 2 × ( 3 x - 1 ) = 20 - 3

2 × ( 3 x - 1 ) = 27 - 17

3 x - 1 = 10 : 2

3 x - 1 = 5

3 x = 5 + 1

3 x = 6

x = 6 : 3

x = 2 → numarul, aflat prin metoda mersului invers